DE102006057796B4 - Cooling arrangement for heat generating electrical components and electrical equipment with it - Google Patents

Abstract

Cooling arrangement for heat-generating electrical components, wherein heat-generating components (7) are heat-conductively connected to an air cooler (5, 6, 31, 32),
wherein the air cooler (5, 6, 31, 32) is arranged on a liquid cooler (3) and the air cooler (4, 5, 6) is arranged between the liquid cooler (3) and the heat-generating electrical components (7),
wherein the air cooler (5, 6, 31, 32) a cooling body (5, 32) with cooling fins and / or cooling fingers, for heat dissipation to the surrounding air,
and a base plate (6, 31) heat-conductively connected to said heat-generating electrical components (7),
wherein the base plate (6, 31) is integrally formed with the heat sink (5, 32),
wherein the heat sink (5, 32) has a mechanical interface for releasable connection to the liquid cooler (3, 34),
wherein the mechanical interface comprises a bottom plate (4),
wherein the liquid cooler (3, 34) has a radiator plate (50, 60) in which recesses ...

Description

The invention relates to a cooling arrangement for heat generating electrical components and an electrical device with it.

From the DE 198 47 789 is a converter known as a device with air cooler. In this case, the running as an air cooler cooling device on cooling fins. The performance of the device is limited by the heat dissipation performance of the cooling device.

From the DE 102 36 525 A1 a valve component set is known in which IGBT modules and capacitors are electrically conductively connected via a rail system, wherein the IGBT modules are mounted together with heating elements on a heat sink having ribs, where air flows past for cooling.

From the DE 202 00 484 U1 a cooling device for components is known, in which a through-flow of a coolant heat exchanger is provided

From the DE 43 22 647 A1 is known a heat sink, which is created from two profiles that mesh in a comb-like manner.

From the DE 20 2004 017 950 U1 a mounting plate for electronic components is known, which comprises a cooling body through which flows through the cooling body, wherein a nut for forming a screw with an electronic component against rotation in a extending on the heat sink fastening device is inserted.

From the DE 199 08 160 A1 For example, an electronic assembly arrangement is known, which comprises a processor and a power supply module, which are held together by a common carrier, to which a fan can be mounted.

From the DE 695 00 342 T2 An electronic control drive is known in which a cooling arrangement for cooling heat-generating components is disclosed, wherein the heat is dissipated via an air cooler.

From the DE 10 2004 055 815 A1 a mounting plate is known which additionally has integrated cooling lines

The invention has the object of developing a cooling arrangement with an air cooler.

According to the invention, the object of cooling arrangement for heat-generating electrical components is achieved according to the features specified in claim 1 and in the electrical apparatus according to the features indicated in claim 18.

Important features in the invention of an electrical device are that heat-generating electrical components, in particular power semiconductors, and a cooling device for removing this heat are included, wherein the cooling device is formed from an air cooler to which a liquid cooler is mounted and wherein the air cooler between the Liquid cooler and the heat generating electrical components is provided. Important features of the invention in the device are also that the device comprises heat-generating components and a cooling device for removing this heat. Examples of heat-generating components are power semiconductors, resistors, in particular braking resistors, and other electronic components with great heat development, such as coils. An advantage of the invention is that the device is air and liquid cooled operable. As an example of liquid, water is used hereinafter.

Under radiator always liquid chiller is read along and under air cooler always gas cooler.

In the cooling arrangement, the air cooler comprises a heat sink, which has ribs and / or fingers for dissipating heat to passing air, and the heat-generating electrical components are connected to, in or on a base plate, in particular thermally conductive, wherein the base plate is formed integrally with the heat sink , and the heat sink has a mechanical interface for releasable connection to a liquid cooler. Thus, no heat transfer between two parts is necessary in the heat sink but the heat propagates within the one part, in particular into the cooling fingers or cooling fins. In the invention is now of particular advantage that the liquid cooler to the air cooler, comprising base plate and cooling fins, is connectable. Thus, therefore, three modes are possible: firstly air cooling with bare air cooler, secondly with connected water cooler cooling only by this and thirdly when connected water cooler cooling by air cooler and water cooler. In the second variant, heat is not released into the ambient air. The integral formation of base plate with heat sink has the additional advantage over an interchangeability of air cooler against water cooler that a detachable interface or heat transfer point between heat generating electrical or electronic components and Air cooler is avoidable. As a result, the cooling capacity of the air cooler in operation without water cooler is significantly increased compared to an air cooler with such interface. In particular, the avoidance of interfaces or material limits particularly advantageous in improving the cooling performance of an air cooler, in which yes, the heat transfer to the ambient air is unfavorable.

In the invention, the base plate is formed integrally with the cooling fins or with cold fingers. It is essential that the heat sink is integrally formed and thus has as little as possible, namely, no heat transfer. So there are only heat transfer from the heat generating components to the air cooler available. With additionally mounted water cooler there is also a heat transfer from the air cooler to the water cooler.

According to the invention, the mechanical interface comprises a base plate for mounting the liquid cooler. In an advantageous development, a water cooler is mounted on the bottom plate. The advantage here is that with a bottom plate an easily manufacturable interface is defined, which provides a good heat transfer to the radiator, in particular by the formation of a flat contact surface, which causes sufficient strength for attachment of the radiator.

The water cooler is detachably connectable to the heat sink. The advantage here is that a water cooler is additionally connected. The water cooling can also be operated simultaneously for air cooling, or it is operated only the water cooling. With additional water cooling significantly more heat output can be dissipated than with mere air cooling.

According to the invention, the device comprises a heat sink having ribs or fingers for heat dissipation to passing air. The advantage here is that a large surface is provided for the release of heat and thus the average temperature in the heat sink is kept low.

In an advantageous development of the water cooler comprises a cooler plate, are formed in the parallel coolant channels, which are preferably connected by connecting parts and / or end parts to a coolant channel system, in particular wherein the coolant channels are formed as a bore and / or as a groove. Preferably, the water cooler is formed at least three parts, wherein as a central part a cooler plate is provided, are introduced into the advantageous in a simple manufacturing process parallel coolant channels. The water cooler further comprises connection parts that connect these coolant channels and thus provide the water cooler for integration into a coolant circuit. These coolant channels are advantageously connectable in series or in parallel. Combinations are also conceivable. In a further development, instead of the bores, other profile cross sections, for example square ones, can be provided, in particular if the radiator plate is produced by continuous casting.

In an advantageous development of the water cooler comprises a cooler plate, are formed in the recesses for receiving and / or passage of a cooling liquid, wherein the bottom plate of the air cooler is at least partially housing forming for the recesses. The advantage here is that a simple production is feasible. Because elaborate holes are dispensable, but the grooves are produced as a die-cast. The grooves are advantageously arranged so that a planar graph is formed in idealization. Due to the direct contact between the cooling liquid and the bottom plate of the air cooler, the heat flow from the heat-generating components, ie the cooling performance, is further improved.

In an advantageous development, instead of or in addition to the grooves, recesses of a different geometric shape are formed, which are suitable for receiving and passing coolant. Also in this case, a part of the bottom plate of the air cooler is at least partially housing forming the recesses, and it are formed by placing the water cooler coolant channels. Examples of alternative geometric shapes include circular recesses, rectangular recesses and irregular recesses with more or less strong ramifications.

In an advantageous embodiment, the recesses of the radiator plate are formed as a meandering groove, which open in laterally or in the rear wall of the radiator plate attached connecting devices, in particular connecting pieces, for connection to a coolant system. A meandering groove advantageously causes a good heat transfer from the radiator plate to the coolant.

In an advantageous development, the bottom plate on surveys, which are designed to match the recesses of the radiator plate, in particular for sealing completion of the recesses and / or as centering. The surveys advantageously cause a whirling up of the cooling liquid when flowing past and thus a good mixing of the cooling liquid. Thus, the heat absorption is improved by the cooling liquid and optimally utilized the cooling liquid.

In an advantageous embodiment, the bottom plate on the cooling fins and / or cold fingers formed spaced from the base plate. The advantage here is that the cooling fins and / or cold fingers are used in a second and third function, namely for heat connection and mechanical connection of a water cooler.

In an advantageous development, cooling ribs and / or cold fingers are formed on the base plate of the heat sink on the one hand and on the other hand, a bottom plate for connecting to the bottom plate is provided on the base plate, wherein the bottom plate and the base plate are integrally formed. The advantage here is that an alternative construction geometry is provided, in which the bottom plate is particularly robustly connected to the base plate. Thus, a secure attachment of the water cooler is advantageously effected on the air cooler, and the cooling fingers and / or cooling fins are mechanically relieved and advantageously filigree ausbildbar.

In an advantageous development, the base plate with the cooling fins or with cooling fingers is integrally formed. Thus, the heat transfer from the heat generating components to the cold fingers is formed without avoidable material boundaries. In general, an advantage of the invention is that different material limits are dispensable and yet a high variety of variants among the configurable cooling devices is achieved with relatively little parts expenditure. It is particularly advantageous that the cooling capacity can be increased by the modular design later, that is after the construction of the device by a simple retrofit.

In an advantageous development, heat-conducting paste or heat-conducting foil is provided between the water cooler and the heat sink. The advantage here is that the heat transfer resistance can be reduced. As materials here are preferably called graphite or aluminum wax coating or the like.

In an advantageous development, the mechanical interface and the means for connecting are designed in such a way that the water cooler and the heat sink can be connected to the contact surface substantially flush. Thus, a particularly good heat transfer is achieved, and it is provided a high cooling capacity.

In an advantageous embodiment, the mechanical interface and the means for connecting are designed such that water cooler and heat sink are connected to the contact surface substantially flat fitting. The advantage here is that the heat transfer gap without gaps, in particular without air holes or the like, is executable.

In an advantageous development, the means for connecting comprise clamping elements. The advantage here is that a quick, easy connection of the water cooler is vornehmbar. In particular, a pressing of the water cooler is made possible to the bottom plate of the heat sink. This pressing is carried out so that the clamping elements cause as uniform a concern.

In an advantageous development, the heat sink and / or the cooler plate can be manufactured as an extruded profile or die-cast. Thus, a simple production of the radiator plate and / or the heat sink can be carried out. In addition, the cavities are aligned along the drawing direction or pressing direction and thus can be traversed in this direction of air and / or coolant.

In an advantageous development of the heat sink comprises cooling fins between a base plate and a bottom plate, which is provided for connection to the water cooler. The advantage here is that a compact design is provided. In addition, it is advantageous that the heat from the base plate on the cooling fins on the bottom plate is transportable and can either be delivered to the flowing past the ribs air or from the bottom plate is further transported away by means of touching arranged water cooling, wherein in the contact area thermal paste is predictable.

Alternatively, the heat sink is equipped with cooling fingers instead of cooling fins. Advantageously, an isotropic cooling capability can be achieved, so there is no preferred direction, especially for convective flowing cooling air available.

In an advantageous development, the cooling body comprises cooling ribs on a base plate, on which a bottom plate is attached or integrally formed, which is provided for connection to the water cooler. The advantage here is that the heat from the base plate on the cooling fins is transported to the air, the bottom plate is arranged laterally. Thus, other relative arrangements of the water cooler are possible. Another advantage is that an alternative construction geometry is provided in which the bottom plate does not affect the convection current of the air cooling. Thus, such a heat sink over a wide power range is used as the exclusive air cooler.

In an advantageous embodiment, a fan for generating air flow along the ribs of the heat sink is provided. The advantage here is that the heat transfer from the ribs to the air flowing through can be improved in air-cooled cooling mode. When using the Water-cooling mode, the warm ambient air is passed by the ribs and gives off their heat to these ribs, which then forward the heat to the even colder water cooler.

In an advantageous development, the device is provided in a closed space area, so that heat from the air of the space area can be dissipated together with the heat of the components via the fins and the water cooler. The advantage here is that the device can be used under conditions in which the air surrounding the device is warmer than the ribs or at least a substantial part of the ribs. Thus, the heat is then removed to the bottom plate and from there to the water cooler.

In an advantageous development, further devices are arranged in the room area, which have heat-releasing components to the air of the room area. The advantage here is that other devices from the first device can be cooled indirectly. This has the advantage that the spatial area of the device, such as the interior of a cabinet, absorbs heat in its air. The heat is then dissipated via the fins and the water cooler of the device. Another part of the heat of the air of the space area is also dissipated via the housing of the device to the environment. Thus, not all the heat must be dissipated through the device with water cooler.

In a further development, the device encloses with its housing parts a space region within which heat generating devices are arranged, wherein the heat or part of the heat can be delivered to the air enclosed by the space region, wherein at least one of the devices comprises a water cooler, the heat-conducting with cooling fins of the cooling device the device, in particular an air cooler of the device, is detachably connectable. In particular, the device is a control cabinet. The advantage here is that with the device and other control cabinet devices are cooled, as soon as the air in the cabinet is warmer than the average temperature of the ribs.

In an advantageous development, the device includes signal electronics, which is designed such that heat from the signal electronics to the surrounding space area can be issued. The advantage here is that even the signal electronics on the radiator is coolable, although only the ambient air and no special means for heat flow control are necessary for this purpose.

In an advantageous development, the device is a converter that includes signal electronics and power electronics for supplying an electric motor. The advantage here is that different performance classes with different heat development can be provided in a housing type of an inverter, and that the housing, which is partially provided with cooling function, as needed, an additional water cooler can be mounted.

In an advantageous embodiment, the device is an electrical device, such as uninterruptible power supply, frequency converter or inverter that includes signal electronics and power electronics for supplying an electric motor. The advantage here is that the power per volume when mounting the water cooler is very high executable.

In an advantageous embodiment, the device is a controller, a converter, a soft starter, a motor starter, or has a motor currents switching or influencing electronics, the device includes signal electronics and power electronics. The advantage here is that other devices for influencing the energy flow can be used.

In an advantageous development, the device has a controller, a converter, a soft starter, an uninterruptible power supply, an emergency generator or a frequency converter, a motor starter or generally a motor currents switching or influencing electronics, the device includes signal electronics and power electronics. The advantage here is that the invention is useful in a field of application in which high heat development is typical.

In an advantageous development, the base plate additionally comprises connecting means for the positive connection with housing parts, in particular also for discharging a portion of the heat to the environment via these housing parts. The advantage here is that the device is executable as part of a modular system for propulsion systems.

In an advantageous development, in each case a fan can be mounted on the air cooler in a variant. Thus, the variety of variants is further increased in terms of achievable cooling performance classes.

Important features in the invention of a device are that housing parts enclose a space within which heat-generating electrical devices are arranged, wherein a portion of the heat can be delivered to the air enclosed by the space area, wherein at least one of the electrical devices comprises a water cooler, the heat-conducting with cooling fins of the cooling device of the electrical device, in particular an air cooler of the electrical device, is detachably connectable, in particular directly or indirectly via a with the Cooling fins or cooling fingers connected bottom plate. Thus, a water cooler for indirect cooling over the air of the space area can be used.

In an advantageous embodiment, the device is a. Switch cabinet. The advantage here is that the combined cooling device of air cooler and water cooler can be used in addition to the cooling of the cabinet interior.

Important features of the invention of a method for cooling an inverter are that the converter comprises at least one liquid cooler and an air cooler and power semiconductor, wherein heat is passed from the power components through the heat sink of the air cooler to the liquid cooler. The advantage here is that a novel cooling method is described for a converter, on the one hand, the cooling of the inverter via an air cooler and a water cooler takes place, which does not affect the air cooling.

In an advantageous development, water is used as the cooling liquid. The advantage here is that a cost-effective coolant is used.

In an advantageous embodiment, the power semiconductors are connected to, in or on a base plate, which is made in one piece with cooling fins or cooling fingers of the heat sink, wherein heat propagates between the base plate and cooling fins or cooling fins without heat transfer. The advantage here is that the cooling capacity of the air cooler is not reduced by avoidable material limits.

Important features of the invention of using an air cooler are that the air cooler is used as a thermal bridge between heat-generating components and a liquid cooler, in particular between air cooler and liquid cooler, a mechanical interface is provided for releasable connection. The advantage here is that the air cooler can be acted upon with a second function, namely the thermal connection of a water cooler.

Important features of the invention of using an air cooler are that a device is provided, in particular an inverter comprising a liquid cooler and heat generating components, in particular power semiconductors, wherein the air cooler passes heat from the heat generating components, in particular power devices, to the liquid cooler. The advantage here is that heat from an inverter can be dissipated via an air cooler and a water cooler.

In an advantageous development of the air cooler passes a significant proportion, in particular 90% or more, or the entire part of the heat generated by the heat-generating components heat through to the liquid cooler. The advantage here is that the water cooler causes efficient cooling of the device. In addition, heating of the ambient air, in particular during installation in the control cabinet, can be avoided.

Important features of the invention of using a liquid cooler are that the liquid cooler is provided on an air cooler of a device for increasing the cooling capacity, in particular such that the air cooler passes a substantial portion or the total heat absorbed by the heat generating components heat to the liquid cooler.

In an advantageous embodiment of the electrical device, the heat-generating components are power modules and / or power semiconductors. The advantage here is that power electronics is providable, especially to control large power, such as electric motors with several kW. Alternatively, the components are braking resistors or they are used in frequency converters or uninterruptible power supplies. The device according to the invention is thus an electrical appliance, which comprises at least power components which are cooled via a heat sink.

The invention will now be explained in more detail with reference to figures:

It shows:

1 an electrical device with air cooler and mounted water cooler,

2 the electrical device off 1 with additionally mounted fan,

3 another electrical device with air cooler and mounted water cooler,

4a the mechanical interface for mounting the water cooler in the device after 1 .

4b a sectional view through the device according to 1 .

5 a schematic diagram of a water cooler for mounting on the mechanical interface of the air cooler,

6a an oblique view of another water cooler for mounting on the mechanical interface of the air cooler,

6b a plan view of the mechanical interface in the assembled state facing side of the water cooler after 6a .

6c a sectional view through the water cooler after 6a ,

In the 1 a device according to the invention is drawn in parts.

It is an air-cooled operable electrical appliance. In the electrical appliance, heat sources such as electronic power semiconductors are comprehensive power modules 7 or power semiconductors whose heat is dissipated to a cooling device. This includes a heat sink with cooling fins 5 ,

In the embodiment according to 1 are the cooling fins 5 between a base plate 6 and a bottom plate 4 arranged.

The heat sink can be produced as an extruded profile, in particular of aluminum. Thus, it is inexpensive to produce and the air can flow in the pulling direction along the ribs and thus absorb the heat.

In particular, the cooling fins 5 formed as filament-shaped extruded profiles, the upper and lower side portions are each formed thickened and pressed together and / or welded to form the base plate 6 from the upper side areas and the bottom plate 4 from the lower side areas.

The bottom plate 4 is designed such that a mechanical interface is provided for mounting on a water cooler 3 holding a radiator plate 13 , a connection part 11 ' and a graduation part 12 consists. The supply line 1 and the return 2 for the water are, as in 1 visible, at the connection part 11 appropriate.

In operation, the device is mounted by means of its bottom plate to a wall, such as cabinet inner wall or machine wall, cooled with air and has only a first maximum allowable power.

In operation, the same device is connected to the water cooler by means of its bottom plate 3 So the cooler plate 13 , mounted and then attached to the underside of a wall, such as cabinet inner wall or machine wall. When only the water cooling is operated, the heat flows from the heat generating components through the heat sink for air cooling through to the water cooler and is then removed with the water flowing through them.

With the invention, it is thus possible to cool an air-cooled device over air and water by a water cooler is anmontierbar. It is important that in the case of the mounted water cooler, the heat flows through the heat sink of the air cooler to the water cooler.

It is also important that a mechanical interface is provided on the contact surface between the water cooler and the bottom plate of the heat sink, ie air cooler, so that the two parts are connected to one another.

4a shows the air-cooled device 1 , where the water cooler was removed. power modules 7 are on a base plate 6 assembled. At the interface between power modules 7 and base plate 6 Thermal paste is applied.

The base plate 6 flows into cooling fins 5 , Thus, an air cooler for the power modules 7 educated. Between the cooling fins 5 and the power modules 7 is thus for every power module 5 a heat path, ie a thermal bridge, formed for the outgoing heat, the only one material boundary - the interface between the power module 7 and the base plate 6 - crosses. Thus, an air cooler with high cooling capacity is provided.

The of the base plate 6 remote ends of the cooling fins 5 are each with a bottom plate 4 integrally connected.

The of the cooling fins 5 opposite side of the bottom plate 4 has a flat contact surface 41 on. The contact surface 41 is edited so that a mounting of a water cooler is possible, wherein the heat transfer resistance between contact surface 41 and water cooler is low. In particular, the contact surface is particularly flat and the surface quality as by grinding with special care or better accessible.

The bottom plate 4 has holes 42 into which screws are screwed for mounting a water cooler. The used water cooler has one to the contact surface 41 suitably trained contact surface. Thus, a low heat transfer resistance is achieved at the transition between the contact surfaces. This heat transfer resistance is further reduced by the use of thermal paste between the contact surfaces.

4b shows the air cooler 4a with mounted three piece water cooler 3 , This water cooler 3 includes a radiator plate in the parallel coolant channels 43 are provided for the passage of a coolant. These coolant channels 43 are about a connection part 11 and a graduation part 13 connected in pairs at their respective ends to form a meandering coolant channel. These are in the connection part 11 and in the final part 13 provided corresponding recesses. The water cooler 3 is thus operable by connecting the coolant channel to a coolant circuit.

In an alternative embodiment, the coolant channels running parallel in the radiator plate are connected via connecting parts attached to the mouth sides of the coolant channels in such a way that a parallel connection of the coolant channels is created. In this embodiment, a supply line from the coolant circuit is provided at a connection part, while a return line to the coolant circuit is provided at the other connection part.

Connecting parts and optionally end parts are integrally connected to the radiator plate and / or positively held by a rail system and / or a groove system. In alternative, detachable connections of the three parts of the water cooler are provided.

In a further development are the holes 42 in addition to the cooling fins 5 facing side accessible. Thus, the holes 42 used for mounting the air cooler on a wall, for example by using screws whose thread diameter is smaller than the clear width of the holes 42 is.

In a further embodiment, the bottom plate is not flat, but it has a different geometric shape, which causes a good heat-conducting contact with the heat-generating components.

In a further embodiment, the connecting pieces are not attached to the side of the radiator plate but at the rear side. Alternatively, the connecting pieces are attached to different sides of the radiator plate.

In a further embodiment, the connecting pieces are designed as threaded holes, in which cooling lines for connection to a coolant system can be screwed.

6a shows a further embodiment of a water cooler according to the invention, which with a bottom plate 4 an air cooler is connectable. A cooler plate 60 has a groove 61 on that in connecting pieces 63 lead to the connection of a cooling circuit. The radiator plate 60 has a flat, ground surface 68 on, which is a mechanical interface to the bottom plate 4 of the air cooler is formed. This mechanical interface is used to mount the water cooler to the likewise flat surface of the bottom plate 4 pressed by means of screws. The screws are arranged at regular intervals, preferably a distance between 2 cm and about 15 cm to produce a uniform contact pressure and a secure seal. This will cause the groove 61 closed, and there is a closed coolant channel formed, which the connecting pieces 63 connects and are particularly suitable for the passage of coolant fluid.

Larger distances of the screws are provided depending on the material properties of the radiator plate, in particular depending on the elasticity, in alternative developments.

6b shows the radiator in plan view of the ground surface 68 and the groove bottom 67 with the surveys 64 ,

6c shows a section along the line AA 6b , The section of the groove shown 61 is about a passage 69 with the adjacent section of the groove 61 connected, so that a meandering groove 61 is formed, as they are 6a and 6b demonstrate. The surveys 64 are arranged at regular intervals and have a height which is less than half the depth of the groove 61 is. The distances of the surveys 64 one another are chosen larger than the longitudinal extent, ie the extension in the groove direction, the surveys 64 ,

In an alternative embodiment, the elevations are arranged in irregular arrangements and / or have an irregular distribution of the individual longitudinal expansions.

In a further development, the bottom plate additionally has centering means such as grooves, noses and / or steps, and the water cooler has suitably designed centering means. Thus, easy assembly in a defined relative position of water cooler and air cooler is possible. Preferably, the centering means are designed such that a load on the screws for connecting the water cooler with the air cooler is avoided to shear. In an alternative or further development, the radiator plate of the radiator such centering means, and the bottom plate of the air cooler is formed corresponding to these.

In an alternative embodiment, the water cooler can be mounted on the bottom plate of the air cooler by means of a tensioning device. The tensioning device comprises, in particular, stirrups, levers and hooks, the stirrups being inserted into hooks for tensioning and, by folding over a lever connected in each case with one of the stirrups, the radiator to the baseplate 4 is pressed. Thus, a fast mounting option is provided.

Other fastening means, such as clamps or latching mechanisms, for fastening the radiator plate to the bottom plate are provided in further developments.

In an alternative embodiment, the water cooler is inserted with one side in a groove-shaped recess of the bottom plate and releasably secured to the other side of the bottom plate, for example via a clamping device of the type described or via a screw connection.

In further embodiments, the mechanical interface between the bottom plate and the radiator plate is not formed as a plane, but it is another geometric shape provided with a good heat-conducting contact between the bottom plate and the radiator plate is effected. By way of example, the mechanical interface runs along a section of a conceptual spherical shell.

5 shows an alternative embodiment of a water cooler. Shown is a schematic diagram of the plan view of the surface of the water cooler, which is intended for connection to the bottom plate of the air cooler.

The water cooler includes a radiator plate 50 in which a groove 51 are formed meander-shaped. This groove 51 opens at their ends in holes 52 , in turn, in connecting pieces 53 end up. A cooling circuit is via the connecting pieces 53 connectable to the water cooler.

Will the cooler plate 50 with its groove side on the bottom plate 4 attached to the air cooler, so is with the now closed groove 51 a closed channel is formed, which the connecting pieces 53 combines. Thus, the radiator is ready for use in the mounted position and can be charged via the connecting pieces with coolant, such as water.

Due to the incomplete design of the coolant channel in the water cooler, the production costs for the water cooler can be reduced.

drilling 56 in the cooler plate 50 Take screws over which the water cooler with the bottom plate 4 the air cooler is connectable.

The radiator plate 50 has sealant in the form of a circumferential seal 55 on. This seal 55 is inserted in a further development in a groove, not shown, or designed as a Loctite tape. The advantage of using a groove is that an inserted O-ring is squeezed in a defined manner when mounting the water cooler. Thus, the O-ring is protected from improper use and consequent destruction, and a secure, sturdy seal is provided.

The water cooler, in particular the cooler plate, is preferably produced by the aluminum casting process.

In alternative embodiments, the water cooler is made of copper.

In an advantageous development, the groove bottom 57 the groove 51 surveys 54 on. These surveys 54 cause a turbulence of the flowing coolant and thus an increased cooling capacity.

In a further development, the bottom plate on surveys, which fit into the groove-shaped recesses of the radiator plate and fill them in part. Thus, the recesses are sealed, and there is formed a coolant channel. The elevations of the bottom plate additionally cause a centering when placing the radiator plate on the bottom plate and relieve in the assembled state, the fasteners. The geometric shape of the elevations is preferably designed such that a sealing completion of the coolant channels is effected by the contact pressure of the radiator plate to the bottom plate.

According to the alternative embodiment 3 is again a water cooler 34 provided on the base plate 31 itself is mountable. This is designed to be T-shaped, that the water cooler is attached laterally. The base plate 31 not only includes the cooling fins 32 but also connecting means 33 For the positive connection with housing parts, so a further mechanical interface. Heat generating components, in particular power semiconductors, are at the rear of the baseplate 31 appropriate. If metallic housing parts are used, a further part of the heat can also flow into the environment via them. The base plate itself is also at least partially housing-forming.

The water cooler is designed in three parts, with inside a radiator plate 38 Coolant channels are provided, and at the end faces a connection part 36 and a graduation part 37 is appropriate. The connection part 36 connects the coolant channels with each other and with a supply line 1 and a return 2 a coolant circuit. The final part 37 connects the coolant channels with each other. cool plate 38 , Final part 37 and connection part 36 are materially connected to each other, in particular by welding or gluing.

A cutout 35 is intended to accommodate a fan. Thus, another variant can be formed, in which the cooling capacity of the air cooler is increased by means of fans.

In an alternative embodiment, the water cooler is made in one piece.

In a first embodiment of the invention, the device is a converter for industrial applications. He supplies an electric motor and controls it. For this purpose, the inverter on signal electronics, which is designed with a thermal barrier to power electronics. The thermal barrier can on the one hand be worse than metal conductive material by a heat and / or by appropriately provided air movement, ie a separation of the power electronics and the signal electronics touching air currents.

In another embodiment of the invention, the device for feeding a medium-frequency current into a primary conductor system, on which movably arranged consumers are provided, which are supplied from secondary inductors inductively coupled to the primary conductor system.

In another embodiment of the invention, the device is a soft starter or a motor current switching device or a power level controller. Alternatively, the device is an electrical device, such as an uninterruptible power supply, ie emergency generator or the like, or frequency converter or inverter.

In one embodiment of the invention, the device is provided in a control cabinet or other luftabgeschlossenen space area. Here, the heat sink with cooling fins takes over 5 another function, namely the cooling of the air surrounding the device, for example, the internal air in the control cabinet. Thus, other electronic devices, which are provided in the control cabinet, can be cooled by means of the heat dissipatable via the cooling fins to the water cooler.

As in 2 is shown, in another embodiment of the invention, an electric motor driven fan 20 provided such that the air flow along the cooling fins is actively driven and / or controlled. Thus, in the first mode, a higher maximum allowable power can be achieved because the air flows not only convectionally driven but much more air flow per time passes through the air cooler. In the second mode, a slightly higher performance is also achievable. Alternatively, however, the ambient air of the device can be cooled, so other devices are coolable.

The fan 20 to 2 is arranged with two other fans in a fan module, which is non-positively and / or positively connected to the radiator, in particular the ribs 5 the radiator.

In a further embodiment of the invention, the heat of the signal electronics of the device is dischargeable to the environment. This can be done directly or indirectly via a heat sink. Thus, if the device is mounted in a cabinet or enclosed space, the signal electronics in turn on the surrounding air and this in turn on the cooling fins of the air cooler of the device can be cooled because it is cooled by the water cooler.

In a further embodiment of the invention, the water cooler is designed mechanically more elastic than the cooling fins 5 comprehensive air cooler. In addition, the means for releasably connecting the water cooler with the air cooler are designed such that the plate 3 just to the bottom plate 4 is created when connecting. Thermal paste or foil may be provided between the two plates. The means comprise connecting screws, which are guided through the air cooler and can be screwed to the water cooler. Alternatively, clamping means are provided as connecting means, which are arranged such that the elastic plate 3 to the bottom plate 4 is pressed, with a uniform possible concern is achieved. In a further development, the clamping means include clamping hooks or other clamping elements

In another embodiment of the invention, the heat sink is different from 1 made from a copper rolled section.

LIST OF REFERENCE NUMBERS

1

supply

2

return

3, 34

Water cooler, liquid cooler

4

baseplate

5, 32

Heat sink of the air cooler

6, 31

baseplate

7

power module

11, 36

connector

12, 37

final part

13, 38

cool plate

20

Fan

33

Connecting means for positive connection with housing parts

35

countersink

41

contact area

42

drilling

43

Coolant channel

50, 60

cool plate

51, 61

Groove, recesses

52

drilling

53, 63

spigot

54, 64

survey

55

poetry

56

drilling

57, 67

groove base

68

surface

69

passage

Claims (21)

Cooling arrangement for heat generating electrical components, wherein heat generating components ( 7 ) Conducts heat with an air cooler ( 5 . 6 . 31 . 32 ), wherein the air cooler ( 5 . 6 . 31 . 32 ) on a liquid cooler ( 3 ) and the air cooler ( 4 . 5 . 6 ) between the liquid cooler ( 3 ) and the heat-generating electrical components ( 7 ), wherein the air cooler ( 5 . 6 . 31 . 32 ) a heat sink ( 5 . 32 ) with cooling fins and / or cold fingers, for heat dissipation to surrounding air, and a base plate ( 6 . 31 ) associated with the heat generating electrical components ( 7 ) Is conductively connected, wherein the base plate ( 6 . 31 ) with the heat sink ( 5 . 32 ) is integrally formed, wherein the heat sink ( 5 . 32 ) a mechanical interface for releasable connection to the liquid cooler ( 3 . 34 ), wherein the mechanical interface is a bottom plate ( 4 ), wherein the liquid cooler ( 3 . 34 ) a cooler plate ( 50 . 60 ), in the recesses ( 51 . 61 ) are formed for receiving and / or passing a cooling liquid, and wherein the bottom plate ( 4 ) of the air cooler ( 5 . 6 . 31 . 32 ) at least partially housing forming for the recesses ( 51 . 61 ). Cooling arrangement according to claim 1, characterized in that the recesses ( 51 . 61 ) are parallel coolant channels, which are preferably connected by connecting parts and / or end parts to a coolant channel system. Cooling arrangement according to claim 1 or 2, characterized in that the recesses ( 51 . 61 ) are formed as a groove. Cooling arrangement according to claim 1, characterized in that the recesses ( 51 . 61 ) of the radiator plate are formed as a meandering groove. Cooling arrangement according to one of claims 1 to 4, characterized in that the recesses ( 51 . 61 ) of the radiator plate ( 50 . 60 ) in the side or in the rear wall of the radiator plate ( 50 . 60 ) attached connecting devices for connection to a coolant system. Cooling arrangement according to claim 5, characterized in that the connection devices are connecting pieces. Cooling arrangement according to one of claims 1 to 6, characterized in that the bottom plate ( 4 ) Surveys leading to the recesses ( 51 . 61 ) of the radiator plate ( 50 . 60 ) are suitably formed, and / or centering for the mounting of the liquid cooler ( 3 . 34 ) are. Cooling arrangement according to claim 7, characterized in that the elevations of the bottom plate ( 4 ) the recesses ( 51 . 61 ) seal. Cooling arrangement according to one of claims 1 to 8, characterized in that the bottom plate ( 4 ) over the cooling fins and / or cold fingers of the base plate ( 6 ) is formed spaced. Cooling arrangement according to one of claims 1 to 9, characterized in that the bottom plate ( 4 ) with the heat sink ( 5 . 32 ) is integrally formed. Cooling arrangement according to one of claims 1 to 10, characterized in that the cooling fins or cooling fingers integral with the base plate ( 6 . 31 ) are formed. Cooling arrangement according to one of claims 1 to 11, characterized in that between liquid cooler ( 3 ) and air cooler ( 5 . 6 . 31 . 32 ) Wärmeleitpaste or Wärmeleitfolie is arranged. Cooling arrangement according to one of claims 1 to 12, characterized in that the mechanical interface has clamping elements. Cooling arrangement according to one of claims 1 to 13, characterized in that the heat sink ( 5 . 32 ) and / or the radiator plate ( 50 . 60 ) is manufactured as an extruded profile or die-cast. Cooling arrangement according to one of claims 1 to 14, characterized in that the surrounding air by means of a fan ( 20 ) flows. Cooling arrangement according to one of claims 1 to 15, characterized in that the liquid cooler ( 3 . 34 ) is a water cooler. Cooling arrangement according to one of claims 1 to 16, characterized in that the cooling arrangement is arranged in a housing, in particular control cabinet, in which further, to be cooled, heat-generating electrical components are arranged whose heat through the surrounding air to the air cooler ( 5 . 6 . 31 . 32 ) and by means of the liquid cooler ( 3 . 34 ) is dissipatable. Electrical device with a cooling arrangement according to one of claims 1 to 17. Electrical device according to claim 18, characterized in that at least one, with the air cooler ( 5 . 6 . 31 . 32 ) Heat-conducting connected, heat-generating electrical component ( 7 ) is a power semiconductor. Electrical device according to claim 18 or 19, characterized in that the device has signal electronics whose heat can be emitted to the surrounding air. Electrical device according to one of claims 18 to 20, characterized in that the device is a controller, a converter, a soft starter, an uninterruptible power supply, an emergency generator or a frequency converter, a motor starter, or a motor currents switching or influencing electronics, wherein the Device has signal electronics and power electronics.

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